In 2012 and 2013, Google alone rolled out over 60 algorithm changes and data refreshes - the biggest update being Penguin 2.0. This impacted billions of search queries and with that, website visitor numbers and revenue for many website owners. Essentially, Google has become smarter at ranking websites with regard to search term relevancy and it's important that you stay on top of the changes and best practices that will ultimately cement your online business into a reliable SEO foundation.